Java IO：删除某个文件夹下的所有文本文件

为了过滤以(.txt)为扩展名的文件，本例实现了FilenameFilter类，及其方法 accept(File dir, String name).

本例会删除N:\\eclipse\\workspace\\JavaIO目录下的所有文本文件。
完整例子如下：

package org.hnrsc.io;

import java.io.File;
import java.io.FilenameFilter;

public class FileChecker {

    private static final String FILE_DIR = "N:\\eclipse\\workspace\\JavaIO";
    private static final String FILE_TEXT_EXT = ".txt";

    public static void main(String[] args) {

       new FileChecker().deleteFile(FILE_DIR, FILE_TEXT_EXT);
    }

    public void deleteFile(String folder,String ext){
        GenericExtFilter filter = new GenericExtFilter(ext);
        File dir = new File(folder);

        //list out all the file name with .txt ext
        String[] list = dir.list();

        if(list.length == 0){
            return;
        }
        File fileDelete;

        for(String filename : list){
            String temp = new StringBuffer(FILE_DIR).append(File.separator).append(filename).toString();
            fileDelete = new File(temp);
            boolean isdeleted = fileDelete.delete();
            System.out.println("File: "+ temp + " is deleted: " + isdeleted);
        }
    }

    //inner class , generic extention filter
    public class GenericExtFilter implements FilenameFilter{
        private String ext;

        public GenericExtFilter(String ext){
            this.ext = ext;
        }

        @Override
        public boolean accept(File dir, String name) {
            return (name.endsWith(ext));
        }

    }

}